Sponge



FIG. 1 is a perspective view of a new design for a sponge;

FIG. 2 is a top view thereof, the bottom view being a mirror image thereof;

FIG. 3 is a left side view thereof, the right side view being a mirror image thereof; and,

FIG. 4 is a front view thereof, the rear view being a mirror image thereof.

The surface shading illustrated in the drawings is provided merely to highlight the contour of design; it is not intended to be illustrative of texture or gloss. 

The ornamental design for a sponge, as shown and described. 